Electrical condenser



Jan. 7, 1930. s. A. BARONE ET AL 1,743,019

ELECTRICAL CONDENSER I Filed June 50. 1927 2 Sheets-Sheet 1 fia yezyZazs Jan. 7, 1930.l s. A. BARONE ET AL 1,743,019

ELECTRICAL CONDENSER Filed June 50. 192? I 2 sheets-sheet 2 J ATT NEY.

Patented Jan. 7, 1930 UNITED STATES PATENT: OFFICE SALVATORE A. BARONE, OF 'W10OISIZDE,4 ANI) SAMUEL ISLER, OF WEST BRIGHTON,

NEW YORK, ASSIGNORS, BY MESNE ASSIGNMENTS, TO FEDERAL TELEGRAPH COH- PANY, A CORPORATION OF CALIFORNIA ELECTRICAL CONDENSER.

Application led June 30,

Our invention relates broadly to electrical condensers, and more particularly to electri-l accurately adjust' anl electrical circuit which the condenser is connected. f

`Still another object of our invention is 'to provide a construction of adjustable plate 0 which may be readily ap lied to a xed condenser of the stack type or varying the electrical capacity of the condenser within predetermined amounts.

y A still further object vof our invention is to provide an attachment and vscrew-adjusting Adevice for application to fixed electrical condensers of standard -construction forincreasing the electrical .capacity thereof by variable amounts whereby the capacity of a number of electrical circuits may be accuratel adjusted with respect to each other.

Ot er and further objects of o ur invention willl be understood from the specification hereinafter following by reference to the accompanying drawings, in which:

Figure 1 shows a condenser constructed in accordance with the principles of our inven` tion; Fig. 2 is a plan view of a condenser embodying the principle of our invention; Fig. 3y is a cross-sectional view through the condenser construction of our invention on -line 3 3 of Fig. 2; Fi 4 is a lateral cross-sectionalview throug the'l condenser construction on line 4 4; of Fig. 3; Fig. 5 is a cross'- sectional view o f the condenser construction along line5- 5 of Fig. 3 Fig. 6 is a theoretical vlew showing the principle involved in the condenser construction of our invention; Fig. 7 is a side elevation of a modifiedconstruction of condenser constructed in accordance 1927. serial no. 202,527.

with our invention and Figs. 8, 9 and 10 are views of the modified construction of condenser illustrated in Fig. Z-showing more clearly the details of construction thereof.

In the construction of Wired radio receiving apparatus where a plurality of carrier frequencies are transmitted over a line wire circuit forv broadcasting entertainment pro--v grams to wired radio subscriber stations, we' have found diiculty in .selecting standard fixed condenser units of proper capacity for accurately adjust-ing the circuits of the wired radio receiver to the frequency of the carrier current channel.

of tuned circuits in which the standard ixed condensers available'onthe market are connected. We have found that it is practicallv impossibleito manufacture fixed condensers in a large production program of sufficiently .7

accurate values as to enable .the exact fre? quency adjustment of each circuit of the chain of tuned-circuits to be made. While it is possible to select fixed condenser units of vthe required capacities out of-a large number'ofv units, itis not practicable to do this. Accordinglyywe have provided means which may be attached to standard fixed condensersV available on the market for introducin suicient variability to permit associated circuits to be accurately adjusted in capacity value.

We provide a resilient platev member which maybe attached adjacent one end of the condenser stack and` spacially adjusted with respect thereto for securing a Vernier control of the capacity ofthe condenser.` We mav carry out our'invention in a: number of different ways, two of which havebeen illustrated in the attached drawings, and we `desire that it be understood that various constructions may be employed and that no limitations upon the invention are intended.

Referrin to the drawingsin more detail, reference character 1 illustrates a condenser stack having insulated plates 2 and l3 at the oppositeen 4 and 5 connected to opposite sides of the condenser. around the stack 1 and end plates 2 and y3 for securing the stack under pressure. The

In a wired radio receiver 1t is generally. necessary to employ a plurality s thereof with eyelet terminals A clamp member 6 is provided eyelet terminals 4 and 5 which pass through the insulated plate 3 also secure angle 1ne1nbers 7 and 8 over the ends of insulated plate 2 for imparting pressure to the stack 1. The construction just described is the usual construction of standard fixed condensers available ny the market. Our invention contemplates the connection of the pressure clamp 6 with one side of the condenser, that is, by means of lead Which connects the eyelet 4, thus tying in the clamp as one plate of the electrical condenser. An insulation sheet 9 is then placed over the clamp 6 and extends over the angle members 7 and 8. The insulated sheet 9 is secured in position by means of a bolt member 11 which passes through eyelet 5 having a retaining head 12 for enabling the bolt member l1 to be maintained in a vertical position by means of lock nut 14. The bolt member 11 passes directly through the insulated sheet 9. A resilient plate member 15 is secured over the bolt member 11 with a laminated spring device 16 in engagement therewith, the assembly being l locked in position by means of nut 17 secured on the bolt member 11. This assembly enables the plate member 15 to be moved in the nature of a hinge about thebolt member 11 as a pivot,and inasmuch as the bolt member 11 is tied into the electrical condenser circuit by means of eyelet 5 there will be a change in capacity across the terminals of the condenser by a change in spacial relation of the resilient plate 15 with respect to the clamp 6.

. This variation is brought about by means of screw 18 which Works into screw-threaded portion 19 of plate 15'. A nut 20 is provided for locking the'screw 18 in a selected position. Contact between the screw 18 and the opposite side of the condenser is prevented by means of an insulated bushing 2O having a socket 21 which receives the end of the screw The operation of the condenser capacity change device is shown more clearly in Fig.

6 Where a condenser stack is illustrated as consisting of alternate conductive and insulated sheets where the movable auxiliary plate 15 is connected to the set of stationary plates 22 and may be changed .in position with respect to the set of stationary plates 23 for effecting minute changes in capacity value.

In the arrangement thus far described it will be observedl that the, auxiliary plate is connected withthe fixed condenser at the same end at which it is mechanically mounted on the fixed condenser. In Figs. 7 to 10 we have illustrated a construction where the variable plate is connected with the fixed' condenser stack adjacent its extreme outer end at the end which is spa'cially related to the condenser stack. We accomplish this by providing a screw, asre'presented at 25, having a head Q4 by which the screw is secured to the fixed` condenser through eyelet 4. The

Screw 25 is secured in the fixed condenser by means ofA nut 26, and a nut 27 is arranged on the screw 25 for controllingthe position of the resilient plate 28. The plate 28 is confined at its opposite end adjacent the fixed condenser stack by means of a clamp 29 which encircles the fixed condenser. It will be observed that the clamp 6 is in this arrangement connected with the eyelet 5 through a lead 30.

It should be understood that it is not necessary to employ the clamp 6 as part of a fixed condenser construction for the spacially adjustable plate may be moved with respect to one of the plates in the fixed condenser stack. Furthermore, various methods of positioning the movable plate with respect to the condenser stack may be employed, and we intend no limitations upon the arrangement other than are imposed by the scope of the appended claims.

What we claim as new and desire to secure by Letters Patent .f the United States is as follows:

1. A device for attachment to a fixed electrical condenser comprising a resilient plate member, meansy for mechanically securing one end of said resilient plate member adjacent one of the terminals of the fixed electrical condenser, and means for changing the spacial ,relationship of the opposite end of said resilient plate member with respect to said fixed electrical condenser, said resilient plate member being electrically connected to one set of plates of said condenser.'

2. A- device for 'attachment to a fixed electrical condenser comprising in combination a iiexible metallic plate member, means for securing one end of said plate ember into mechanical engagement with said'fixed electrical condenser, and means for changing the spacial relationship of the other end of said flexible plate member and said fixed electrical condenser for varying the electri-l cal capacity across said fixed electrical condenser within predetermined limits.

3. A device for attachment to a fixed electrical condenser comprising a metallic plate member arranged to be flexed intermediate its ends, means for securing one end of said plate member into mechanical engagement with said fixed electrical condenser and establishing electrical connection between said plate member and one side of said fixed electrical condenser, and means for spacially adjusting the position of the opposite end of said plate member with respect to the opposite end of said fixed electrical condenser.

4. An attachment for fixed electrical condensers comprising a fiexible metallic sheet member, an adjusting screw carried by one end of said flexible metallic sheet member, and means carried by the other end of said flexible sheet member for mechanically securingy said sheet member to said fixed condenser, said screw member being arranged to bear upon said fixed electrical condenser for varying the spacial relationshi of said plate member with respect to said xed electrical condenser, said sheet member being electrically connected to one set of plates of said condenser.

5. An attachment for fixed electrical condensers comprising in combination with a fixed condenser ofthe stack type having a pair of eyelet 'terminals at opposite ends thereof, an auxiliary plate arranged to be secured at one end to one of said eyelet terminals and arranged to be adjusted in spacial relation at its opposite end with respect to the other of said eyelet terminals for varying the electrical capacity of said condenr within predetermined limits. f

6. An attachment for xed electrical condensers comprising in combination with a fixed condenser of the stack type having a pair of eyelet terminals at opposite ends thereof, a flexible plate member having means for securing one end thereof `with respect to one of said eyelet terminals in electrical connection with one side of said electrical condenser, an insulated bushing arranged to be secured in the other of said eyelet terminals, anda screw member carried by saidtplate member and arranged to engage said msulated bushing whereby said plate member may be changed in spacial relationship with respect to the stack of said lixedelectrical condenser for shifting the electrical capacity thereof withinpredetermined limits.

In testimony whereof We affix our signatures.

SALVATORE A. BARONE.

SAMUEL- ISLER. 

